Source : Webster's Revised Unabridged Dictionary (1913)

Cockloft \Cock"loft`\ (?; 115) n. [Prop., a loft where cocks
   roost.]
   An upper loft; a garret; the highest room in a building.
   --Dryden. Swift.

Source : WordNet®

cockloft
     n : a small loft or garret